Small Engine Troubleshooting Problems? Ask a Mechanic Now.
If the mower will not move, how r you sure wheels are going opposite directions? they will do this normally when wheels are off ground anyways
Is that with mower on the ground, or rear end jacked up in the air? Sorry to sound like I am asking dumb questions, but it makes a difference as to what to check next. Did you pull wheels at anytime ?
Check that both keyways are in the axles still?
What is the model of this machine?